<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>用户登录</title>
</head>
<body>
这是用户登录页面 <br>

<form action="/do_user_add" method="post">
    用户名：<input type="text" name="username"><br>
    密&nbsp;&nbsp;&nbsp;&nbsp;码：<input type="password" name="password"><br>
    <input type="submit" value="提交">
</form>
</body>
</html>